Tuesday, February 06, 2007

Harvesting the Crop

More photoshop for today for me. Not like I mind or anything, this is actually more interesting than talking about computer ethics. I like doing photoshop.

We learned all about pixels today. Pixel is a single bit of information on a computer image. A picture is made up of thousands of pixels. Each of this has their own hexadecimal code. When you change the number of pixels, you change a bit of the image every time. A good number of pixels for printing out a picture is 1800 by 1600. A good number of pixels for posting in the internet is 72 over all. This is just because when you reduce the number of pixels, you're reducing the megabytes. This way, it takes the pictures to load faster and cheaper to send it over from one computer to another. The more pixels you have, the more detailed your picture would be.

You can always change the number of pixels you have. However, when you're going from a low number of pixels and increasing it, the computer can only work with the number of pixels present so when you increase it, the resulting picture would become blurry. The computer would just think of what codes it would make for the picture to have more pixels. It doesn't know what really looks nice. When you go the other way around, when you decrease the number of pixels, the computer throws away the pixels it thinks it doesn't need.

Another thing we learned is cropping. Cropping is simply just taking a part of the picture and making that the whole picture.

Levels is the other thing we talked about. We can change the levels of each picture to what will satisfy us. By this, I mean that we can change the level of each of the colors red, green, or blue. When we do this, we either make a picture brighter or darker in each of the color. It's a good way of editing a picture.

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